Plume (44 38.5'N), Vent 1 (44 40'N), Vent 3 (44 41'N); Vent 1 is longer and more complex than Plume site; axial cleft not as distinct at Vent 1 as at Plume site; Vent 3 is intermediate in character between Plume and Vent 1 sites; Note: Plume, Vent 1, and Vent 3 are sites within a larger South Cleft field - Kappel and Normark (1987): "It was speculated after the intensive photogeologic mapping of the cleft during the 1983 field season that the cleft was, in fact, continuous at least through the recognized vent areas"; southern Area 1 in Crane et al. (1985)

Notes Relevant to Biology:

extensive hydrothermal biota

Year and How Discovered (if active, visual confirmation is listed first):